Cito da fs-uk:
Info is in vehicle's XML file. For example: newHollandT6160.xml
<washable dirtDuration="50" washDuration="1" workMultiplier="4" />
Interpretation:
- dirtDuration: base rate for how many minutes until vehicle gets dirty from 0 to 1. If you're just driving around on roads, your vehicle will dirty in 50 minutes. Warning for all grass watchers: if you're in your comfy cabin watching grass grow, you're vehicle will get dirty even if you don't move an inch.
- washDuration: how many minutes washing will take.
- workMultiplier: divide base rate with this if you're doing field work. It is also counted as field work if you're on a field and not working at all. However there's something fishy going on in here: in game multiplier always seems to be 2.
In sostanza dovrebbe bastare aumentare il dirtDuration (ed eventualmente anche diminuire il workMultiplier).