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Rainwater bad for paintwork ?

Question :

1. I wash my car with collected rainwater for conservation reasons. Someone says it harms the paintwork as rainwater is acidic. I argued that cars are constantly exposed to rainwater anyway. What do you think?

2. My instruction manual says do not let wax get onto the windscreen. However, wash and wax preparations will inevitably get wax residues onto the windscreen. Is it necessary to use wash without wax preparations only for the wind- screen?

Answer :

1. If the rainwater collected is from a slight shower, then the acid content would be higher as it would collect the suspended pollutants. However if the water is from a downpour, the acid content would be lower. Anyway since you are collecting large amount of water, I do not think there is a problem and the amount is too small to make any difference.

2. Wax is very difficult to remove from windscreens but most of those wash and wax car shampoos do not actually contain wax but a chemical that coats the paintwork and even if that gets on the glass, the coating is very thin and does not affect visibility. So check the container before use to make sure that it can be used on glass.

 
   
 

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