I know it's been 12 years since the original post, but i think the Karcher PCL 4 scrubber might be the answer., although it is not as easy to find.
I'm in Europe and the price for one of this is around 250 USD.
I did order it and waiting to see if it's as good as the reviews said.
Hope it helps.
--
For full context, visit
https://www.homeownershub.com/mainte...ck-316460-.htm