If you search the net with keywords like "buy isopropyl alcohol singapore", you should be able to find several sources. As IPA is typically for industrial applications, the minimum volume sold may be too much for just sporadic use, mine came in a gallon sized plastic container - but it's became a very handy cleaner (& disinfectant).
Note about use: As the alcohol evaporates very rapidly, it does leave behind a residue rather quickly which you have to buff off - Wet, wipe, buff; wet, wipe, buff ...
All the usual precautions around highly flammable liquids apply! - Otherwise it's generally safe, as we usually come into direct contact with it using our bare hands when we wet tissues with it to clean stuff. Thoroughly wash your hands with soap and water after use.
It'll be cool for everyone if you can purchase it from the pharmacy. However, make sure it's 99% pure IPA that you are getting and not what's known as Rubbing Alcohol (for external medical use) which is 70% diluted IPA.
While trying to get the IPA liquid, tried prickly heat powder and it works! The powder actually picks up the "stickiness" when brushed away from the rubber surface and doesn't stays on the surface causing it to look greyish. Thanks guys!!!