Any experienced tree trimmer has heard of this, has done it, and most WILL do it, IF you don't wait till AFTER you get your price. Wait till the crew is there and the saws are coming out, and they may just leave. Kinda depends on if you grabbed the door knocking fly by night crew or the big guys... let's beat the dead horse again... you get what you pay for.
Myself, I ask to see this done prior to the start, but I told them at the bid this was going to happen. If they say they do it after every job, I ask to see the stuff they use. Now if you would prefer to get your job done and aren't REALLY concerned about this, I suggest you don't open this can of worms just because you want your tree guy to think you know more about his job than he does.
If I am using a cheap small company that I don't normally use, I don't even bring this up... BUT If I have a diseased tree in the job, I have them do that tree last.
It takes a LOT of alcohol to properly sanitize a chain saw, I would suggest if you are REALLY worried about this, or do have diseased trees in the mix... get a large stainless dog bowl and a bunch of bottles of alcohol. Also a good fresh 4x4 to run the blade in after each dip.
If you don't make them try to figure out how to do something they don't know how to do, and go get the supplies they don't know they should already have, they will gladly use your stuff, you will get your job done, and they can pretend like they do this all the time, but ran out of alcohol.
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