Hi to all, Chemicals would be nice, even with all the problems and precautions...but, I can't use liquids as I only need to address certain areas in the interior of each part, (can't tolerate drips and runs!) .... Masking and blasting seem to be the most promising, and maybe I can reduce masking time as I go along...

..... I am open to all ideas and suggestions... best to all, til….lat'r.....GT....