Dahlia bulbs and grubs!

Dahlia bulbs and grubs!

Hello Everyone, I had some lovely dahlias last year and I allowed them to overwinter in the garden. My thinking was that a)they were in quite deep and frost wasn't a worry and b) we were supposed to have a 'mild' winter this year. WRONG! Anyway, the bulbs that have survived are lovely and big but they are covered in tiny, white grubs. I'm not sure what I should do to with the bulbs now - are they diseased for good? Could I apply insecticide spray? Or should I just wash them with washing up liquid and water? Any help or advice would be brilliant!
Plant ID — found in a gorge in upstate NY

Plant ID — found in a gorge in upstate NY

Living Room.

Living Room.

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