A solution when absolutely desperate.
Sodium hydroxide. It is available at Woolworths and Coles. Its cheap.
It is dangerous stuff.
Using caustic soda (sodium hydroxide) (CS)must be done in small quantities at first. It will react with water and become hot. Add it to water in small amounts. Make up a small amount, fairly concentrated. Place a small amount on the "blob" and examine the result.
Be very careful to only use a small amount in case a strong reaction happens. CS will damage clothing and many organic substances. Its great for removing hardened grease from pans. If the blob is on any paper, cloth etc its not advisable to use CS. It usually does not harm metals but aluminium may discolour or react, depending on the alloy.
When I use CS for cleaning pots etc in the kitchen I have a running water tap on hand just in case something goes wrong. CS washes easily away with water. I've been using it for years and maintain a healthy respect for it. It is also the main ingredient in Draino.
Cheers
