Windscreen washers stopped working. all fuses ok,wipers working ok.front & back washers not working

The fuse box is located down or just above where a driver puts their left foot, under the steering well and below the coin box. According to ABMforum.com: "The front wiper rear wiper and washers are on separate fuses (15A WSH front and rear washers 25A WIP front wiper 15A RR WIP rear wiper)."

Check if you have fluid in the washer bottle. Take a fine needle and clear out the nozzles that spray on the screen, try the washer again, you should be able to hear the motor running. If there is no sound, check the motor/pump, it will be located near or in the washer bottle. The wiper and washer normally share the same fuse.

most windscreen failures can be traced back to blocked nozzles as the water and the cleaning product causes corrosion that blocks the small jets
another reason is that the plastic reservoir cracks and drains the water out unknown to the operator
so those are the 2 areas to check first

Fuse nr.31, F31, (25A) = Windscreen wipers
This fuse is placed on fuse box / relay plate engine bay 1, under bonnet in engine compartment area!

If the fuse F31 is OK.
You must diagnose why windscreen wipers going slow and/or stopping.
In order to find out the cause of wipers stopping you can try follows:
1. Carefully extract the wiper arms from their axles (two pieces). In some cases you need to use an extracting tool. Heed of the windscreen !!!
2. Disassemble the plastic covers from the bottom of the windscreen.
3. With the bonnet up you can start the engine, (transmission in "N" or "P" position and parking brake on). Now you must switch on the control lever of the wipers, and go to the engine compartment. If the wiper motor runs let the wiper motor running for a few minutes and switch off. Go to the step 4. If the wiper motor do not runs you must check first the electrical feeding of the motor. It is necessary to unscrew three bolts of the mechanism and disconnect the electrical coupling (difficult assurance). If the electrical feeding is OK you must replace the motor - steps 5, 6, 7. If not you must check electrical connections, the control switch of wipers and electric cables.
4. Now you must check the two bearings of wiper mechanism with your hand. In the most cases the left bearing is out of order (is very hot). This is the most encounter fault of the wipers running at Audi.
5. For have enough space to manipulation the wiper motor together with their mechanism you must extract the plastic cover of the engine computer box, and extract also the box screws. Then you can move slowly the engine computer box, just for a few milimeters.
6. You must disconnect the electrical coupling of the motor (difficult assurance), unscrew three bolts of the mechanism and extract together with the motor. You must move them slowly between windscreen and engine computer box until the wiper motor go out together with the mechanism. This is the most difficult operation!
7. Now you can repair the bearings, replace entire wiper mechanism or replace the wiper motor. It is not very simply, but it works.
Heed of the windscreen !!!
Refit all in reverse order.

My wife has a 08 Fox and her front wipers stopped working it's just a fuse in bank 7 a 10 amp just replace with a new one or swap for the 10 amp fuse in bank 11 (just a warning lamp for the handbrake) until you get a new one. ;-)

You actually have a wiper relay this should assist you swap with another see if functions
Service and Repair
The wipers are controlled by two relays, located in the engine compartment fuse box.
These are wired in such a way that one relay will run the wiper when energized, and stall it when de-energized (Front Wiper-Run/Park Relay).
The other will select either fast or slow speed on the wiper motor (Front Wiper-Fast/ Slow Relay).

the switch is the most likely culprit i have had this befor ewasher works but wipers dont

Most cars turn on the wipers when the washer pump is turned on. Look for a stuck switch or relay in the washer circuit. It seems that the wipers think that the washer is on.

If it is the same as some other Chevrolets they have 2 pumps attached to the side of the washer bottle. 1 for rear and 1 for front windscreen

check the switch on the steering usualy it becomes faulty after a while and also your window washers could be blocked but try turning it on if you do not hear a buzzing sound the motors needs to be replaced.