White stains/marks after cleaning

[LetMezz]

Hi,

When I clean my masks + tubes I notice white stains/marks appearing on the surface after it has dried. I'm just wondering what this is, and how to prevent this?  I use warm tap water and mild soap .

thx,
Letmezz

[Big Guy]

No idea as to what it might be. When I clean my equipment, it's HOT water and Dawn liquid dish soap. 

[StratCat48]

Mineral content in the water, hard water? From a private well or municipal water supply?

Hot water and Dawn dish liquid here also.

[LetMezz]

Thanks all for your response. Yes I do use the municipal water supply. I don't have Dawn liquid dish soap where I live.

I think it is likely calcium from the tap water. I'll try cleaning it with water from my distiller, or/and with vinegar and see if that works...

[Big Guy]

Vinegar should get rid of all those marks / stains. I use it in my water reservoir as needed and it works great.