Homegrown trim restore

Looks awesome. I used metal prep from an auto body supply shop that also worked very well. I'll bet lye was much cheaper. The metal prep brought the shine back to my sill plates with a wipe down but its harsh and you need gloves. I got that tip from my Dad who painted plenty of aluminum in the RCAF "Royal Canadian Air Force". He painted my 70 340 duster when I was a kid. I was the only guy I know who's paint job was guaranteed to stay on at mach two.