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Ceramico tiling
HiAqua Mix Heavy Duty Tile & Grout Cleaner and Aqua Mix Nanoscrub will sort that for you. Available off tradetier.com or off E Bay. Wet a small area of the path preferably a bad bit then apply the HDT & Grout cleaner and allow it to dwell (Sit) for 15 minutes make sure you keep it wet then add a little nanoscrub and work that in. (All this is helped if you have or you can rent a low speed Rotary Scrubber fitted with a medium scrubbing brush and a good wet Vac) Then once you have allowed it to dwell rinse it off and vac dry. Then I bet your next thing will be to say they look fantastic wet but a bit jaded and dull when they are dry! If this is the case you can seal the whole lot with Aqua Mix Enrich and Seal Penetrating Sealer and your good for 15 years.
tel
tel
This might sound obvious but need to clarify this before I try it.
Is the purpose of the wet vac just to constantly remove the dirty water,whilst new fresh water is being added to the area being scrubbed?
Thanks