A light coating of non-stick cooking spray on shower glass and hardware, left for 5 to 10 minutes, then wiped off with a cloth and rinsed with cold water, cuts through soap scum and leaves a slight residue that helps slow new buildup.
Three Hints for Soap Scum and Stubborn Stains

Shower glass and hardware build up soap scum fast, and cooking spray of all things makes short work of it.
Remove Soap Scum With Cooking Spray
Lift Sweat Stains With Vinegar
A mix of one part vinegar to four parts water, sprayed onto underarm or collar stains and left to soak for at least a minute (longer for set-in stains), then washed as usual, clears out yellowed sweat stains.
Treat Grass Stains With a Sugar Paste
A thick paste made from a half cup of sugar and a little warm water, applied directly to a grass stain and left to sit for at least an hour before washing as directed, lifts the stain out surprisingly well.
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