unGer HYDRO POWER ULTRA UHP01 Mode D'emploi page 11

Tips For Cleaning With Pure Water
After cleaning I see stains or smudges on the window.
What could be causing this ?
The cleaning was not thorough enough:
Make sure to wash off all visible dirt and residue. Rinse thoroughly.
Cleaning detergent residue on the surface:
If the window was previously cleaned using traditional method, it may take up to
2-3 rounds of cleaning with pure water to achieve desired results and remove all soap
residue from the glass.
The water is not 100% pure:
Water is considered pure when its TDS measure is 0 ppm - use the TDS meter to check.
To help ensure spot-free cleaning, the resin should be changed when the TDS meter
reads 10 ppm.
Consider the overall quality of the water being used, e.g., well water may contain
contaminants that make it unsuitable for window cleaning.
Wrong movement of the brush:
Always wash and rinse from top to bottom.
Dirt around the frames:
Over time, dirt may accumulate in and around the frames, especially when silicone joints
and rubber seals are not watertight. Water can loosen and transfer the dirt onto the glass,
so wash and rinse thoroughly.
How do I clean wooden window frames?
Avoid glazed or oiled frames:
Pure water dissolves the oils or tannin.
Varnished window frames:
Avoid using pure water as it may accelerate stripping of these coatings.