Wood rot stains on white vinyl siding

At a customer’s house, somebody has bolted 2x12’s against the siding under the windows to attach flower pots to & the wood is very rotten. The rotten wood has left stains below on the white vinyl where it has dried on there. They are removing the wood themselves to eliminate the source of the issue & I’ll be headed over there to shine it up once that happens. Will SH remove the stains? Or will it take something fancy like One Restore, etc…? Just want to make sure to show up prepared. Thanks in advance dewds!

Will make this real simple - carry both, lol.

I appreciate the advice! I’ve been considering expanding the arsenal a bit when it comes to cleaning products.