I did my mk7, the back was open so I drove the front up the curb so it was higher at the front then I blasted the floor.
Only concern is there a fair bit of electricals on the floor plus the underside of the carpet is lined with a sponge material which you don't really want to get wet.
My suggestion is a bucket of soapy water and a sponge, wet but dry
56 350 2.2 130ps mk7 with 2 side doors
65 290 2.2 125ps custom with 2 side doors
07 350 170ps
Ids v86 licence + v86.04 update + xprog
hereIds map
here