Thanks guys,

at the moment, we are scraping with a furniture scraper to get the pitchy spots off. It is looking much better. When that is done, we will try the cleaning tips you have given us and let you know which worked best for us. Lucky for us, we don't have any iron or fastener stains. Mostly just natural (birds/dust/inky glove prints & some drips of hydraulic fluid) spots. -Patty