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Even the dust picked up during transit was cleaned off once the gun was deployed. Not to mention that the crew had better chance to maintain their equipment.
Towed guns would get a dirty as their prime mover. it may not crash through buildigs but would get muddy and dusty
Don't mean to start an argument, but there's the answer above.

Towing is usually done mostly on roads. Tanks get dirty when they start travelling cross-country, through ditches, mudpools, bushes and all that yazz, at the deployment stage, during battle. Even tanks don't get too dirty during roadmarch, and they were (and are) cleaned as soon as they reached their assembly point. (There have been countless discussions about this subject, and it generally boils down to this: tanks did not last usually for so long for rust to be appearing, and they were regurarly cleaned, and damage repainted by their crew, as it was important for the morale not to use run-down looking equipment.)
The guns are pre-deplyed in fortified positions -that means they have less tear-and-wear during their lifetime, and more chance for maintance. Once things get hot (the front gets too close) they are either removed, destroyed or captured. But not stratched, muddied and oiled from head to toe. Just look at any war-time photos in any of the books about artillery and the 88s particulary. No paintchips (paint did not really chipped, anyway), no visible mud-build up. All the guns look like they just came out of the factory. (Many of these photos are propaganda photos, but not all.)