Muriatic acid certainly would remove it but not recommended. The acid might cause damage to the grout or even etch the tile. I would use one of the milder solutions available at most home centers (LimeAway eg.)
To remove soap scum off a slate shower you will need a soap scum remover cleaning product. This is the best and easiest way to remove the scum. Some people use a bar of glycerin soap and have success. However, this will make the cleaning process longer.
vinegar
There are several ways to get soap scum off a shower curtain. One of the easiest ways I have found is to put the shower curtain in the washing machine with a couple of bath towels and wash it on gentle after spraying it with a commercial cleaner. Then during the rinse cycle I also add about a 1/2 cup of vinegar. I find my shower curtain fresh and like new.
If you are trying to remove soap scum, use Comet bathroom spray. Let it sit for a few minutes and scrub with a Scotchbrite pad, then rinse. Comet bathroom spray has citric acid, which will break down the soap scum. It does work.
Wash with sodium carbonate solution. (Na2CO3). otherwise known as Washing Soda or Soda Crystals. A solution will remove and clean bathroom/shower waste . Also try vinegar.
To remove soap scum off a slate shower you will need a soap scum remover cleaning product. This is the best and easiest way to remove the scum. Some people use a bar of glycerin soap and have success. However, this will make the cleaning process longer.
The answer: YES. Muriatic acid is the best solution for cleaning scum off of fiberglass hulls. Forget expensive hull cleaner or any other "marine" product that claims to remove. Muriatic acid removes all scum/discoloration without any effect to the gel coat for about $6/gallon. Get a garden/lawn sprayer, an open area (for venalation), long pants/shirt that you don't care about, rubber gloves & goggles. The Muriatic acid will do the work, only light scrubbing may be necessary as the chemical dissolves the scum itself. Once the acid has sat for 5-10 mins, spray with water and then wash with a mild soap. In the end, you will have a brand new looking hull. Remember to wax after to protect in the future.One word of caution is that the Muriatic acid fumes are very powerful. Be sure to be in a well venalated area and wear a painters venalator mask if necessary.Enjoy your brand new looking hull!
Scrubbing Bubbles Soap Scum Remover is great at removing soap scum from your glass shower doors.
There is new technology and understanding of soap scum. Soap scum is calcium stearate and magnesium stearate. Try using BioWorx.us "green" soap scum cleaner. They have discovered how to remove soap scum with a corn based surfactant. They show interesting laboratory proof they dissolve soap scum while other cleaners can't. Showers also have what is called sebum which vinegar and most other homemade products can't clean. Sebum is the waxy oil our bodies secrete. A good shower cleaner must remove soap scum, scale and sebum to be effective.
Cleaning soap scum off of a glass shower door can proove to be very difficult. This is due to the fact that soap scum can easily build up and become very resilent to removal. The best product to clean this soap scum is the product CLR.
hair and soap scum which is grease
Wet shower is useful for cleaning mold and scum off of shower stalls. It does not release harmful chemicals. Wet shower cleans without having to scrub.
vinegar
I have heard that WD-40 lubricant will work. (makes since...it's made from fish oil) I've never tried it myself though.
Try using a 50/50 spray of water and white vinegar. I use it every day after my shower, and it keeps down mildew and soap scum buildup. I also find it beneficial to add some baking soda to the drain to keep the shower odor-free.
lemon juice or vinegar and some newspaper
There are several ways to get soap scum off a shower curtain. One of the easiest ways I have found is to put the shower curtain in the washing machine with a couple of bath towels and wash it on gentle after spraying it with a commercial cleaner. Then during the rinse cycle I also add about a 1/2 cup of vinegar. I find my shower curtain fresh and like new.