Fresh grout makes tired tile look new and keeps water out of the walls. Below are the tools we'd use, the order to do it in, and the videos worth watching first.
Estimates. The DIY range is from FixUpFirst's regrouting guide; the pro range is from Angi.
Tick items off as you shop. Ratings and review counts were checked on 2026-10-14. Home Depot prices are as of 2026-10-14. Amazon shows its price at checkout.
Does the grout removal for you. Brushless, variable speed. Bare tool; battery sold separately.
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Universal-fit carbide blade for 1/8" joints.
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Wide, non-stick gum rubber face that packs joints fast.
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Compact float that's easier to handle in tight shower corners.
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Rounded corners won't dig out fresh grout. Plan on two or three.
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Polymer-modified, rated for showers. For joints up to 1/8".
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For wider joints and shower floors.
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100% silicone for inside corners and the tub/pan joint.
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100% silicone, waterproof, same-day water-ready.
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The pro's grout sealer, sized for one shower. Apply after the grout cures.
Affiliate link placeholder · Home Depot prices as of 2026-10-14 · Amazon prices shown at checkoutClean the shower, cover the drain, and put on eye and dust protection. Cut out old corner caulk.
Run the grout blade down the center of each joint, at least 1/8" deep. Let the blade do the work.
Vacuum every joint, then wipe with a damp sponge. Dust left behind weakens the bond.
Mix to a peanut-butter consistency, let it slake (rest), then remix. Only mix what you can use in about 30 minutes.
Hold the float at 45° and press grout diagonally across the joints, one wall at a time.
Turn the float nearly on edge and scrape diagonally to remove the excess.
Once the grout firms (15–30 min), wipe with a well-wrung sponge to shape the joints. Buff off the haze later.
The next day, run silicone in the inside corners and at the tub or pan joint.
Wait 48–72 hrs, apply penetrating sealer, wipe off the excess, then keep the shower dry for 12 hrs.
Our picks of the clearest tutorials. Credit and copyright belong to the creators.
Full shower walkthrough: removal, cleanup, regrouting.
Visit channel ↗Shows a floor, but the float and sponge technique is the same.
Visit channel ↗Use unsanded for joints 1/8" or narrower (most wall tile) and sanded for wider joints and most shower floors.
Not reliably. Remove at least 1/8" so the new grout has enough depth to bond and doesn't flake off.
Caulk. Inside corners and the tub or pan joint move, and grout there cracks. Use 100% silicone.
Seasonal maintenance, the tools worth buying, and a new job guide each month.