Explain the dry-cleaning of clothes or explain why grease stains can be removed by petrol.

(N/A) Petrol and grease are both hydrocarbons and are non-polar in nature.
Grease is a mixture of higher alkanes,making it sticky and non-polar. Petrol consists of lower alkanes,which makes it volatile at low temperatures.
According to the principle of "like dissolves like," non-polar solutes dissolve in non-polar solvents. Since both grease and petrol are non-polar,the grease dissolves in the petrol.
When clothes are treated with petrol,the grease stains become soluble in the petrol,allowing the stain to be removed from the fabric,thereby cleaning the clothes.