When you first meet him, use the Holy Water. This will set him on fire for a few seconds and give you enough time to run. Run down the steps (where the lion fountain is located) and run past the door. There should be a small outhouse. Run in there until the music stops. If you enter the house and he appears, run up stairs. He will follow you. Go into the room and under the bed (if you have not found it already). There should be a secret ladder leading to somewhat of an entertainment room. When down there. Acid Man will appear. When he does, look for a fire extinguisher and use it against him. This will cause the room to become filled with white smoke and he will not be able to see. Use this chance to get out of the room. If you are on the other side of the big fans outside when he appears, go through the only door there. Go down the stairs and into the first door. Go all the way into the back. Alyssa will see an electric box when he comes in, and is close enough use it against him. This is another chance for you to escape. After he has fries, he should come out again. If he does, run past the door (where the electric box was located) and past the ghost (whose spirit you must set free). You will reach somewhat of a dead end. Stand there for a few seconds, and the music should stop, indicating that he left. If Acid Man follows you down there, use the Holy Water on him and run back and out the door to where the giant fans are located. Stay there until he follows you. When he does, run around the junkyard and back in the door. Go back to where that dead end is located. Another way if he follows you again is to walk towards the wall, and on that small walkway Alyssa will walk against the wall and he will be gone. Beware -- when you do the bridge part he will appear again and say "I found you".