DPF cleaning is done with a vacuum and compressed air. Basically remove as much soot as possible with the vac, then use compressed air blowing in from the exhaust side. Cleaning is done when no soot or ash comes out. Bad cells can be found when compress air returns on itself instead of coming out the input side ... enough "bad cells" and the filter will be very restrictive.

A wire slightly smaller than the cell size with a sharp point can be used to try and unplug/pierce the blockage to get flow again .... It must be done carefully !

No chemicals are used to clean the DFP

Hope that helps.

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