I’m Hetti, a volunteer at Manchester Museum and recently I spent a day working in conservation to clean up some glass slides with thin sections of coal balls and fossilized wood. They had become very dirty sat in storage for a number of years and were being transferred into more suitable card trays lined with acid free tissue paper which will help to preserve them and keep them clean for years to come. Having them neatly stored also makes them much easier to find when they are needed in the future.
To clean them up the dirt and dust was removed with a tissue and then I used swabs dipped in a mix of water and methylated spirit to clean the glass and remove any dust and dirt remaining. I found it a very rewarding job to see the final results all cleaned up and easily accessible for anyone who wishes to use them in the future.