Yeah, I've got a few gallons of 30% H202 sitting in the garage (because the 3.5% household variety was out of stock on Amazon, I ordered from a lab and we dilut

Yeah, I've got a few gallons of 30% H202 sitting in the garage (because the 3.5% household variety was out of stock on Amazon, I ordered from a lab and we dilute it ourselves). Requires wearing some protective clothing when dealing with it. Even when diluted to around 5-10% it can cause irritation and burns. That said, it's also not shelf-stable. After about 6 months of being opened it'll just be a gallon of water. Still cheaper than buying the branded stuff.