I dropped by the local Harley Davidson store today; to buy some wax and a t-shirt. The owner/manager gave me a free bottle of S100 SEPC; only thing is I don't where to use it . I searched the forum already and i'm still unsure what is does. Is it a polish or a paint prep? Plus how strong is the cleansing ability compared to Vanilla Moose or Meg's #80 lineup?