Hope you don't blame me for saying, but i hope you had a good reason to let your dealer do the bulb replacement. Because if you can't do that yourself, i'm affraid cleeaning them won't be a job for yourself :p.
All jokes aside, it is possible.
Take out the foggrill covers.
Remove the 3 bolts that hold the fogunit.
Unplug the power cable of the fog.
Remove the bulb by turning and pulling it.
Take some paper tissue on a small stick or something simular and clean the inner side of the lense.
Might want to leave the foglight unit open and keep it overnight in a hot place so any wet/water can vaporate.
-> Reverse the above and install them back in.
I never had fogged-up stock fogs, but maybe you want to put some silicone between the lense and housing. I had to do that aswell with my skoda led fogs. After driving throught a few rainy days the foghouse was nearly 1/4 filled with water

. After dissembling it and cleaning it all and kit up the lens-housing, they are now dry and still fully working.
Good luck.
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