Fella's, Help me out on this one - How concerned should I be about spreading weed seeds, brown patch, or any other unwanted thing from yard to yard via my mower deck and/or tires? Usually, on each job, before the mowers get loaded back on the truck, I will blow any debris off of the front and/or top of the deck before going to the next job. How effective can this be though? I mowed a weed infested yard that was sadly fescue free (horror of horrors!!!! ) and then proceeded to a lovely 3 3/4" thick fescue lawn (aaahhhhhh ). Halfway through the job, it hit me like a ton of mulch - I may be contaminating this yard! Visions of guys in gas masks and full body suits hosing my Hustler down with Clorox ran through my head! Even if the surface of the deck is clean, life under a mower deck is nasty! I am already thinking about changing my weekly route according to weed grass lawns first; thoroughly clean mowers; then mow weed free lawns. Am I going overboard, or should I be legitimately concerned?