To obtain your homemade limewater (made of oil and limescale), keep stirring for 1 minute some limewater with an oil of your choice (50% of each). To apply your mixture, use disposable or reusable cotton. Only prepare small quantities in order, for the oil, to not oxidise (rancid odour) and, for the emulsion, to be better stored.
There are lots of other ways to use limewater. Click here for more information.