Car making squealing noise Options

[CAMAricer]

Hi guys, got a weird problem. Hope someone can help me.

My car is making a high pitch squealing noise when the car is parked and I turn the wheel hard (all the way) in either direction (let's say to get out of a parking spot). If I let up just a bit (return the wheel towards it's neutral position), the noise stops. Also, at night when I do the same thing with the headlights on, I can see the lights get slightly dimmer. Soon as I let off, the lights return to normal. So I think there might be a connection there.

I first noticed this problem when I changed the break pad on my car (for the first time). I ended spilling some break fluid over the rotor/caliper and haven't used brake cleaner to clean it up yet, don't know if this info helps or not.

[CAMAricer]

So I went to the shop that put the belts on and the guy said he thought one of the belts was kinda loose, so he "fixed" it a few seconds. Now the noise is almost completely gone (95%) but when I make a hard turn on the wheel (like all way) I can barely make out the sound.

I'm thinking I'm just being picky now, but should I continue to monitor this sound or is it not really a big deal?

Oh, I'll check the power steering fluid today too to see it it's low or anything.