One reason the vinyl sided houses have to be washed, with the humidity so high in the morning in the summer and the AC is on, the house sweats like a beer bottle and grows mold and algae. The walls do not have sufficient space on the inside for insulation thick enough to prevent the siding from sweating. The side of the house that does not get direct sun stays wet longer in the morning and shows more grunge. This does not help electric bills.
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