Are there visible deep scratches? If so you probably won’t be able to do anything with it.
If not cleaning will certainly help but as I said above, just playing it helps more than anything. I’ve often found that old records which have perhaps not been played for 20 years sound awful at first but start coming to life after two or three plays. Nothing cleans the accumulated gunk out of the grooves better than the needle itself (you do have to clean the needle though).