I found the highest concentration of sodium hydroxide in a certain drain cleaner at the local hardware store. I pour 1 gallon in a 55 gallon drum of water. I can clean and strip the paint from whatever will fit in the barrel. I use an immersion burner to boil it. I can do an entire small vehicle for about $30 of drain cleaner.
Drain cleaner has about 5 times the concentration of sodium hydroxide as Zep Purple, and costs a lot less.
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