maybe ts got male syrupt on the contact lens so have to wash to remove the protein buildup
Don't wash your eyes with the contact lens saline solution.
ya, wash your eyes with dettol better
Use contact lense liquid or some of the other solutions/moisterisers available as an alternative.
I guess if you are in a situation where you don't have access to a proper solution, then tap water is better than simply putting the lense back onto your eyes after dropping it onto the floor. Just don't use tap water as a habit, but once in awhile I don't think will cause too much harm.