SWIM had small patches of cobweb growing on his fruiting cake and now he dunked the cakes into a 2% H2O2/98% H2O to get rid of the cobweb but the question is how the cakes should remain into the solution?? Need answer ASAP

Treating with dilute h2o2 probably won't help much, whether minutes or hours, best would be to checkout which environmental conditions need to be tweaked to discourage cobweb. A friend lost many cakes to cobweb, but monotubs performed well.

I'm pretty sure once a substrate is contaminated, it needs to be thrown out. Sorry bro.

Yeah going to remove them I guess and the other problem is that I removed them from the jar too early there were no pins shown yet

I found indoor grows to be difficult in general . Mold was an issue
no matter what I tried . I changed the approach to tubs outdoors during
warm months. Incubating in pre sterilized bags indoors then a transfer
to tubs outside . I can say that clean fresh air exchange is a big issue.
Mold can be a real problem without good clean air exchange .

So you say fresh air exchange is important , what if I put my fruiting chamber/incubator underneath an always open window ? I sadly can't grow outdoors since it will be suspicious to my neighbors ...

I've grown in closets, no problem. Just fan and give FAE (fresh air exchange) multiple times a day. My avatar picture was grown in a closet.

If you really want to try salvaging contamined cakes you can always try sterlising a spoon, scooping the contams away and treating the area with diluted H2O2. If you're lucky the mycelium might take a firm enough hold to fruit.

It happened later on I sprayed the whole Fruiting chamber with a dilute H2O2 and now fruit bodies are growing , I am glad I didn't throw away the cakes