The perils of travel photography..
Ok, so this has just happened. A photographer that I know had been cleaning his equipment and packing for a long trip, he started with his camera bodies and then moved on to this lenses. Unfortunately, the container with his sun screen is the same colour and size as his lens cleaning fluid, you can guess the rest. At least his lens doesn’t have to worry about getting sunburnt.
Always double check everything. When I clean my lenses I only ever spray the cleaner into a microfibre cloth never directly onto the glass.