Cleaning/Prepping for Silver Brazing.
I started brazing my first frame yesterday -- lugged, silver brazed. Paterek suggests a mild acid based toilet bowl cleaner for the final prep -- to remove any oxidation -- prior to brazing. The mildest acid product I've been able to find is muriatic acid which is 20% hydrochloric acid, 80% water, but I believe it is still far stronger than the toilet bowl cleaner, and Paterek warns against using anything too strong.
So yesterday, I made sure my joints were freshly sanded just before brazing, and I skipped the acid wash. (I had previously cleaned with min. spirits and lacquer thinner). I think I made strong joints, so I'm wondering how important or necessary the acid wash is, and if so then how much I should dilute the muriatic product.
Also, Paterek recommends lacquer thinner after the min. spirits, so that's what I used, but I'm wondering if I can substitute denatured alcohol since it's a little less toxic.
Thanks for any help.