We have found that the best bang for your buck for your monthly tile scrub is OxiClean Powder. We did a test of several different cleaning methods, including my favorite hydrogen peroxide and baking soda method and OxiClean Powder gave me more for my money and with less effort.
Here's what to do: Mix up a solution of about 3 tablespoons powdered oxygen bleach (something like OxiClean would work) and warm water in a 2-gallon bucket. With a sponge or cloth, swipe it around the surface until the grout lines are full. Let it soak in for at least 15 minutes, then rinse well with clean water.
Choose the right floor mop: Clean tile with mild detergent and clean water using a rag or chamois-type mop ($33, Home Depot) rather than a sponge mop. These mops are best for cleaning tile because sponge mops push dirty water into the grout lines, making them harder to clean.
Don't use OxiClean on wool, silk, or other off-limits fabrics.
SPRAY directly onto the spot or stain until saturated. TREAT NOW, WASH LATER Let stand for 5 minutes to up to one hour depending on the severity of the stain. For fabrics that are prone to color change, do not let stand longer than 5 minutes.
probably at least a cup of the Oxy Clean and Biz, ½ - ¾ cup of Cascade and ⅓ cup of Dawn. if you are using a larger container, use more soap. then, mix it all up.
Sometimes, with soap scum, professionals will need detergents or degreasers as well to clean it thoroughly. Bleach is good for removing mold and mildew from your shower grout, but it's more of a temporary solution. You need to really clean the mold from within and seal the grout to prevent any mold from spreading.
Apply the cleaner
In most cases, vinegar is the best product to clean shower tiles. However, if you are using another cleaning product, the process is almost the same!
For safety and prevent serious tile damage, try to avoid using oil-based, abrasive, and ammonia or bleach-based cleaners.
Bleach & Baking Soda
This has always been reported as one of the quickest and best methods for cleaning mold or mildew from grout, tiles and walls. Make sure you wear gloves. Spray the solution onto the affected areas and allow to dry.
OxiClean™ Versatile Stain Remover should not be mixed with Chlorine bleach or household chemicals other than in the wash with your regular laundry detergent.
OxiClean™ Versatile Stain Remover works in any temperature water, but best in warm to hot water. Do NOT use boiling water.
Using OxiClean™ Laundry & Home Sanitizer can help remove germs, odors and stains around your home. The 3-in-1 powder kills 99.9% of bacteria and viruses* around the home. That includes your laundry, carpets, floors (including bathroom tiles) and couches.
WARNING: Injurious to eyes. Harmful if swallowed. Contains sodium percarbonate and sodium carbonate. Avoid powder or solution contact with eyes and prolonged skin contact (wear gloves).
Oxygen bleach Oxygen bleach (like OxiClean) is an alternative to chlorine bleach, and it's safe for many fabrics. You can use it to remove stains on colors, as well as whites. It doesn't contain scary chemicals and it won't ruin most fabrics—though you should avoid using it on silk or leather.
Mix hydrogen peroxide and baking soda in a bowl to form a thick paste. Spread the paste onto your grout using an old toothbrush to completely coat the area to be cleaned. Let it soak in for about 5 to 10 minutes. Like the previous method, use a brush with firm bristles to scrub the grout.
Mix 3.5 cups hot water, 3 tbsp of lemon juice, 1/2 cup Baking Soda, and 1/6 cup white vinegar. Using a spray bottle, apply the mixture along the grout itself, making sure it's totally saturated. Let it soak in. After about one hour, spray the grout one more time and then mop it all away!