There are many scam ones that run a little brush through and charge you, but the reputable ones can fully scrub the ducts.

Also, Hal has some good suggestions like brushing your teeth right away and others.Highly recommend that book!

You don't want to jump out of the frying pan into the fire.If this woman has "your best interest at heart" as you claim, she should be willing to absorb some of this loss on her side of the ledger, or at the very least work out some kind of credit moving forward.It's not fair to paint them all with the same broad brush, but it seems when it is not their own money being spent, many PMs seem quite cavalier about this sort of thing. 

You will fall down many times but you'll need  to get up and  brush yourself off and continually try again until you acquire your desired affect. 

@Bryan ClementTo me, working out is like brushing my teeth...and I never go to work without brushing your teeth

I just brush it off.

For that reason, work with the tenant to resolve rather than brushing it off.

The irony is, banks tell you to keep it static and place it with them yet they turn around and lend your money for a profit!

But here, seems that anyone who can brush teeth can give advice on your back pain.

Replace all hardware with brushed nickel hardware.