If I remember corectly, the germicidal reacts to SH and produces toxic fumes.

If you are waiting on shipment for Ammonyx M - Apple Butter and need a good bulk dish soap,

The Members Mark dish soap from Samsclub works well. It does not have anti-bacterial chemicals in it to cause a chemical reaction and it thickens your roof mix pretty well.

In case you run out of Apple Butter, this dish soap works.

The big 90oz bottles of Dawn is now anti-bacterial dawn at Samsclub so I had to try this new Members Mark soap.

http://www.samsclub.com/sams/shop/product.jsp?productId=prod1113319

This is an older thread but I found 1 gallon size jugs of Dawn at Sams here in Florida for $9.95 each..

I try to make what I am going to use for the day but some times I have little left over for the next day I just add little more to my SH and water to my mix make fresh again. But also learned that I from many sites to keep my soap in diferent bottle because your costumers will walk around you rig check things out and you donot not want them seeing that you are using bottle of dawn do to wal mart in the automotive deparment pick up black bottle that you would put used oil in has handle use to poor your soap.

Pristine Roof Cleaning New Jersey wrote:

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but if you make the mix with dawn and use it right away thats ok right? but ive been buying dawn at a dalla store 90 oz $450

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 Youre getting ripped off!!