Sometimes I need to mow in less than ideal conditions (damp grass and muddy areas with poor drainage). Naturally, this leaves my x540 looking terrible. I plan to pressure wash the wheel rims and deck while trying to avoid the spindles. I'm hoping someone can recommend a good pre-treatment cleaner. Should I use a degreasing agent for the grass "stains"? I don't expect it to look brand new but I'm doubtful that pressure washing alone will do the trick. Thanks!