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Liz,
I had one of these nights at Parramatta in Sydney. The skyglow was pretty bad and we had a lot of moonlight as well. Even omega Centauri looked washed out. Spent most of the night looking at either Saturn or the Moon, simply because this is what the public kept asking to see. You could also look at some double stars like alpha Centauri. I think nebulae will be difficult even with the OIII filter but you could try it for an experiment.
I clean my filter by blowing any grit off first, breathing some moisture onto the surface and then using a soft micro-fibre lens cloth. I think the coatings are pretty tough. Don't use any chemical cleaners.
Regards, Rob.
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