Water spots are minerals left behind when rinse water dries. A final rinse with demineralised water leaves nothing behind, so glass and paintwork dry clean.
Why water spots form
Tap water dries and leaves its dissolved calcium, magnesium and salts on the surface as white marks. The harder the water, the worse the spotting, especially on dark paint, glass and polished alloy.
How a spot-free rinse works
After washing and the normal rinse, a last pass with demineralised water displaces the tap water. When it dries there are almost no minerals left to mark the surface, so vehicles can air-dry without towelling.
Setting it up in a wash bay
- Keep the demineralised water in its own IBC or tank and feed it through a separate line or wand.
- Use plastic or stainless fittings. Demineralised water can pick up metal from mild steel, galvanised or copper fittings.
- Keep the IBC out of direct sun to limit algae.
- Use it for the final rinse only, not the main wash.
Buying for a wash bay
A busy wash bay usually suits a 1,000 L IBC, at 80c a litre on a timber base. We deliver by tailgate truck and swap the empty IBC free on the next delivery.
See demineralised water prices and sizes, IBC and bulk supply or the spec sheet.