I would not worry to much about conditioning or cleaning dirty power, basically a snake oil sales technique. I suppose if you want to find a nice surge protector to give you peace of mind you can, just don't wast to much money.

I've had good luck with my TrippLite HT PowerBar

M80s VP180 4xM22ow 4xM3ic EP600 2xEP350
AnthemAVM60 Outlaw7700 EmoA500 Epson5040UB FluanceRT85