Gumout fuel system cleaner safe for manuals?

I have found Gumout great to use to clean bicycle chains. I take Gumout carburetor cleaner in an aerosol can, spray the chain, wipe it off after a minute, and re-oil.
@the_same_mountainbike–My doctor agrees with you about supplements. I tried to get him to prescribe Geritol for me. Instead, he convinced Mrs. Triedaq to take me fitness walking five days a week. We walk three miles each of these days and do it in about 45 minutes. In the winter, we walk in the university’s basketball arena. There are college physical education classes where the students do walking that are often in the arena. These students walk too slowly for us and don’t walk nearly as far. Mrs. Triedaq thinks that maybe that some of today’s college students are the ones that need the Geritol.