I'll try and keep this (relatively)short.

When I drain and refill my car's coolant this weekend, I was considering using a "Flush" or "Cleaner" product. Good or bad idea? Any opinions?

I'm talking about one of the little bottles you can buy to add in with the water after the old coolant is drained to clean out deposits, etc.
I would drain that mess and then flush (run up to temp and then drain) straight water or 50/50 mix through the system and then finish up with the 50/50 mix.

I've seen some white deposits inside my radiator and I'm under the impression the cooling system was neglected along with the rest of the car.

Anyone have some input or had any experience with this?