Cleaning 2 twin DPF filters from Audi Q7

We got Audi Q7 with a significant drop in power 4.2 TDI.
In our workshop, we managed to diagnose the cause.
Car with over 300,000 km, DPF filter almost completely clogged.
Disassembly and assembly of two DPF filters took us less than 3 hours.
Then cleaning the filters in 2 hours.
The client left the car at 08.00 in the morning, at 14.00 he already enjoyed the return of power behind the wheel of his vehicle.