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[personal profile] ymarkov
http://www.kashrut.org/halacha/?law=kashering (excerpts):

* Glass, plastic, glazed china, glazed dishes, Corelle, Pyrex, Corningware, or glazed earthenware does not need any Koshering for Passover, since they do not retain any flavor.

* Sinks, refrigerators, trash cans, counters, dishwashers, stovetops, tables, cutting boards, mixmasters, silver kiddush cups, and anything not used with hot foods from the fire do not need any koshering.

Date: 2009-03-26 04:44 pm (UTC)
From: [identity profile] anna-i.livejournal.com
what???

Date: 2009-03-26 04:54 pm (UTC)
From: [identity profile] ymarkov.livejournal.com
The Law, the whole Law, and nothing but the Law...
(I need to kasher this userpic :-)

Date: 2009-03-26 04:58 pm (UTC)
From: [identity profile] anna-i.livejournal.com
is this a joke? does it mean I've nothing to do before Pesach?

Date: 2009-03-26 05:05 pm (UTC)
From: [identity profile] ymarkov.livejournal.com
No, it's not a joke, and yes, you do have to prepare for Pesakh. But I find it immensely helpful, psychologically, to know which preparations are required by Law, which are a humra, and which are stam spring cleaning.

(E.g., you really don't have to cover your counters and abutting walls with aluminum foil or whatever. But my wife likes doing so, because it makes Pesakh really different.)

Date: 2009-03-26 05:09 pm (UTC)
From: [identity profile] anna-i.livejournal.com
I don't cover my counters because they are granite and can be kashered. But sinks??? dishwashers??? All the guides say that sinks have to be cleaned, hot water over them, and don't use for 24 hours. Dishwasher we cannot use at all.

Date: 2009-03-26 05:36 pm (UTC)
From: [identity profile] disbalanced.livejournal.com
No, it's not a joke, and yes, you do have to prepare for Pesakh. But I find it immensely helpful, psychologically, to know which preparations are required by Law, which are a humra, and which are stam spring cleaning.

Больше того - эта информация позволяет правильно расставить приоритеты и, в условиях нехватки времени на подготовку к Песаху, обеспечить необходимое за счёт хумр, а не наоборот.

Также не будем недооценивать влияние этой информации на Шолом Байис.

Спасибо, в общем, порадовали.

Date: 2009-03-26 04:59 pm (UTC)
From: [identity profile] anna-i.livejournal.com
change to a wine bottle, then it is kosher for passover and year round.

Date: 2009-03-26 08:03 pm (UTC)
From: [identity profile] onionsoupmix.livejournal.com
I'm going to email this to my husband, who is probably going to tell me to stop wasting time on sites that advocate reform judaism.

Date: 2009-03-26 08:28 pm (UTC)
From: [identity profile] antidos.livejournal.com
Baruch Hashem, no more pessach cleaning !

Yea, yea, yea !!!

I think this pessach I will be makpid not to eat pita bread when I am ordering a takeout in a local middle eastern shwarma place :)

true, but......

Date: 2009-03-27 12:17 am (UTC)
From: [identity profile] bringing-peace.livejournal.com
If glass was used for hot hometz, it needs to be kashered. (this is from my Rav, who isn't into humros).

Dishwashers use very hot water;
stovetops get spills from boiling pots;
sink - even though ppl don't wash dishes w/ boiling water, I use boiling hot water to soak the pots;
if draining pasta into sink which has food residue in it - food gets cooked.

we're treading a very fine line here.

Also, as far as I know, glass needs to be soaked....

Re: true, but......

Date: 2009-03-27 12:36 am (UTC)
From: [identity profile] ymarkov.livejournal.com
Al pi din, AFAIK (I need to double-check) you only need to kasher vessels from which you will be eating. Thus, whatever you pour into the sink is irrelevant. Dishwashers - the rule of "kasher it the way it is used" ought to apply. (R' Abadi holds that hard plastics are not absorbent.)

Glass - if it's not absorbent, then it's not. Period. Soaking glass, AFAIK, is an Eastern European custom, not halakha.

Re: true, but......

Date: 2009-03-27 12:55 am (UTC)
From: [identity profile] bringing-peace.livejournal.com
Al pi din, AFAIK (I need to double-check) you only need to kasher vessels from which you will be eating

still though, if you put dishes into the sink & things will get hot... you will have a problem.

Dishwashers - the rule of "kasher it the way it is used" ought to apply. (R' Abadi holds that hard plastics are not absorbent.)

but plastic is highly absorbent - my own experience shows it clearly (all right, he's entiteld to his opinion). BUT even ppl who hold that dishwashers are kasherable have you wait for 1 year before cashering.

and, as an aside, food residue collects in the top of the drain of the dishwasher and unless it's cleaned, kashering is probably not valid.

My Rav said that Pirex is not exastly glass as it's somehow treated... don't remember details.

As far as glass that came in contact with hot hometz (as in pooring into glass serving dish directly from a pot) - it is somehow a problem - but don't remember exact details. For some reason think that our Rav said it's not kasherable at all. Will have to e-mail him.

Re: true, but......

Date: 2009-03-27 01:12 am (UTC)
From: [identity profile] ymarkov.livejournal.com
if you put dishes into the sink & things will get hot... you will have a problem.
You'll have, at most, iruy k'li rishon water going down on the maybe hametzdik surface, not the other way around. Unless you plug the sink, what will be the problem?

plastic is highly absorbent
Yes, soft plastic that's used for cold storage. Hard plastics that are used in hot products, like dishwashers, are not. Never heard about the 1-year rule - AFAIK, no such beast in halakha. Ben yomo is 24 hours.

Regarding dishwashers, see http://kashrut.org/forum/search.asp?keyword=dishwasher - half a dozen relevant questions and answers. Food residue in the drain - again, it's all washing down, not up. And even if it is up - just last week, we put a dairy plastic bowl in our fleishig dishwasher, and my rabbi (a Lubavitcher) ruled exactly like R' Abadi - that it's not a problem.

Pyrex is thermally-treated soda-lime glass - "the most prevalent type of glass" () If anything, it's even less absorbent than regular glass.

"It is somehow a problem" - yes, in our heads. We laypeople are just used to thinking "anything hot is problematic". IMHO most rabbis go along with that so as not to encourage laxity in other areas. Policy, not halakha.

Re: true, but......

Date: 2009-03-27 01:52 am (UTC)
From: [identity profile] bringing-peace.livejournal.com
Unless you plug the sink, what will be the problem?

water backups do happen.....
(even really hot ones - did it at least twice)

Pirex and glass - I'll ask again, b/c I don't remember all details.
I never thought of Pirex baing a problem untill was told so.

"Food residue in the drain - again, it's all washing down, not up.

Doesn't the water circulate during the wash?

just last week, we put a dairy plastic bowl in our fleishig dishwasher

not a problem for what? - the dishwasher or the bowl or both?
did the bowl had dairy food in it?

I heard once that dishwasher is so hot, it kasheres everything inside it - but it was years ago, so don't remeber details.

the 1-year rule - AFAIK, no such beast in halakha. Ben yomo is 24 hours.

e-mailing my Rav now.

"It is somehow a problem" - yes, in our heads.

nop, not only in my head.
Here is from the link you provided:

http://kashrut.org/forum/viewpost.asp?mid=37945 :

"Drinking glasses can be used for either dairy or meat. Other glass dishes such as corelle, glazed china, pyrex and the like should be designated for meat or dairy. If one is used for the wrong food, it will not be an issue."

Re: true, but......

Date: 2009-03-27 03:56 pm (UTC)
From: [identity profile] ymarkov.livejournal.com
Water does circulate during the wash (http://home.howstuffworks.com/dishwasher.htm). However: 1) it has detergent added to it, which both turns the ta'am from food residue to ta'am lifgam and makes sure that whatever food particles are present in the spray do not stick to the dishes; 2) the point is that it cleans the dishes, rather than cooks in them. This is why in the olden days Jews washed meat and dairy dishes together in the same tub, often with hot water. And so my rabbi said that there was no problem for either the bowl or dishwasher.

Note that R' Abadi says that mixing up whatever glass vessels is not an issue. I suspect that his advice here may be a precaution. You don't want to get too cavalier with meat and dairy. Policy again.

Re: true, but......

Date: 2009-03-27 02:04 am (UTC)
From: [identity profile] bringing-peace.livejournal.com
Hard plastics that are used in hot products, like dishwashers, are not.

so why does the plastic turn yellow? it doesn't oxidize.

Re: true, but......

Date: 2009-03-27 03:29 pm (UTC)
From: [identity profile] ymarkov.livejournal.com
It's called heat aging and is related, AFAIK, to gradual leaching of plasticizers. But I'm not a materials engineer...

Certain foods have very clingy residues and can discolor vessels made from softer plastics. I'd guess that acidic oils are a major factor here.

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