I haven't a clue about this either way, but you may want to mention what kind of finish your bass has, for the people that might have one.
I used pledge for awhile. Never had any problems. But you can get a large container of instrument wipes for about $10 and they last a while.
Well I use it on my acoustic guitar and ukulele and it usually gives them a good shine so I'll just try it. Its white anyways so you wont be able to tell but I just will anyways.
I have a luthier friend who uses it on all of the guitars that he works on or builds. I've used it, but prefer a fairly new Fender product done in associaiton with Mequiar's called mist & wip finish enhancer. Sometimes, pledge is a little difficult to get off of chrome type stuff.
If it's non-wax Pledge, that's OK, but wax Pledge will build up over time and actually make it look dull.
My recommendation would be to get yourself some Alembic Super Polish. I use it on all of my basses and it works great. It doesn't create build up and gives the bass an extremely smooth and sleek feel. It can be had at alembic.com and is not very expensive. A bottle will last you a couple years. Best Wishes, Bones