Why don't you tell us since I don't think we have any UK notes. lol wouldn't hurt to try. Also with the oven cleaner. I believe that the oven cleaner is a lot more expensive than the lye. Which means loss in profit. You get more runs with lye and it's cheaper... Also saves precious time. "time is money"
I was feeling 20 lb 25% cotton and 20 lb seemed a bit thin, could be me though. Has anyone tried 100% cotton paper? I saw it at the store but can't remember what LB it was. That might add to the feel of real bank notes. When you slide currency between your fingers notice it has that "fuzzy grab"? and 25% cotton for me kinda slides? Although I haven't tested the 25%. Does the dunking provide the fuzzy grab as well? I might steal a sheet just to do a test. depending how thick it is though. But so far 25% is the closest the average person is going to get.