My daughter spilled nearly 1/2 a gallon of water in the back floor well of my wife's convertible a few weeks ago and I didn't find out until days later. Peee------eewwww.
The odor neutralizer did a great job.
I removed the front seat and seatbelt allowing me to pull up the carpet/foam some to air it out after sopping up the standing water.
I liberally applied the ON to the floor mat, carpet, foam and then also in the HVAC vents.
All's good now.
Regarding your carpet brush.
I have 2. One is used primarily for the cars and the other for in the house cleaning up dog accidents.
That one gets a fair amount of fur and carpet lint in it.
I was able to clean it out really well just using a metal pick. (a small screwdriver would probably work too, but the end of mine had a 90deg bend to help grab the lint). I spent about 20-30 minutes at it, but probably got 98% of lint/fur out.