Have some light brown stains creeping down the side of my 35' vinyl sided chimney. I'm sure its some stray creosote from the cap. Stove has been runnin like a champ, nice and hot, nothing but heat waves pouring out the chimney, except for some white smoke when reloading, just some steam. My question is, will the light brown stains permanently stain the vinyl siding??? Gonna power wash the house in the spring. I usually use bleach as a pretreatment before I power wash. The brown stains just look like hell on white vinyl siding. Any cleaning tips would help. Hopefully the powerwasher will take care of it in a few months.