Only ways to prevent them are to:
1. Park under cover
2. hand dry after the rain
The water droplets act like little magnifying glasses when the sun hits
them and the war is on at that point. Best option is to apply a good
quality polish 3 or 4 times a year to fight the effects of the sun,
wash regularly and carry around a 100% cotton clean beach towel to wipe
the car down after each rain. This will save you loads of trouble.
I suggest Zaino polish, not cheap but the most effective I've seen.
========================Zaino is an amazing product. As previously mentioned though, it is not
If you follow all their suggestions, Dawn soap to strip old wax, clay
bar to remove impurities, Fieldcrest 100% cotton made in USA towels,
and then purchase and apply the whole package, not only rain spots
won't be a problem, the car will gleam in a way that is quite
astonishing - with none of those swirl marks that can ruin the
appearance of a black finish to the discerning eye.
Car even looks good after being in the rain. Most of the water spots
will be on the windshield!
They call it a polish, but it is completely abrasive free. Doesn't even
contain any "cleaners" as do many general purpose waxes. The result is
that over time, you can actually layer the finish to deepen and improve
Main point for your purposes is that it is excellent for repelling
Leaves a very slick finish.
I applied the whole package couple of years ago, and since have simply
been using the wash and wax product with a natural sponge and drying
with a chamois, continues to gleam with exceptional brilliance on a
finish that was not new when I began.
I also use the Zaino tire product and DP Gel alloy wheel cleaner from
another site for the stock wheels.
Most common remark is the "car looks new" and it's a 1994.
there is this magic layer of coating that would protect it,
all u need to do is apply this oil-looking thing once every month. and when
the rain hits it it just wash it to the side with no stain and no spot. the
only problem is i forgot its name, in in autozone.
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