OK guys, need some input. I finally got started on the rebuild of my 20 hp B&S V-twin for my Jac. I sprayed degreaser and power washed it before dis-assembly, but it has a weird yellowy finish in spots that looks like left over clear coat on the block. I'd like it squeeky clean but I'm not sure I want to go the bead blast route. Any ideas? Anything you guys have seen that will beautify the aluminum without harsh side effects? Thanks in advance.