Grout lines not releasing dirt used high pH then tried Viper Renew no change whats next?


Well-Known Member
Sep 28, 2014
Real Name
Peter Dymond
Test the grout when doing the estimate.
Clean with alkaline cleaner first.
Then apply acid.
If the grout fizzes with acid it isn't sealed or coated with wax.
If it doesn't fizz then use a little stripper and see if anything changes.

As far as method goes, use GM first always.
Spray grout lines first, then dwell for 5-10 mins.
Then right before rinsing, mist the whole floor again with GM.

Use a spinner. 150° at 1200 - 1500 psi

If there are spots that didn't clean up, treat with acid and clean again.

If the grout is badly stained then sell color sealer.

This is why I spend time doing a thorough estimate inspection.


New Member
Sep 15, 2018
Real Name
scott ziegler
Guys I can't tell you how much I appreciate the advice shared here. I own a turbo -hybrid -12 so it's in the tool chest. I didn't realize the spinning effect was that much greater than direct pressure to the groutlines and my bad and didn't consider Grey brushes for tile. small investment. I've got groutmaster coming in this week and will use my oreck with stuff bristles as well as spinner. I'll let you know how the reclean goes. thank you all.
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Todd the Cleaner

Todd Cottino
Premium VIP
Sep 4, 2011
Pahrump, Nevada, United States
Real Name
Todd Cottino
Business Location
United States
I use 1200-1500 psi with a Turbo-Hybrid TH-40 almost every day to clean tile. Jeff uses 2000 psi all the time. Works great and not once has the pressure ever damaged the grout. I have seen broken up loose grout get sucked out by the vacuum but the grout was damaged prior to cleaning. Be sure to inspect well for cracked or broken grout prior to cleaning and point it out to the customer.

P.S......I almost never scrub grout lines. Groutmaster, 10 minute dwell time, spinner. Cleans it up perfect almost every time. Once or twice a month I’ll have to use acid on a stubborn floor.


Well-Known Member
Aug 16, 2006
Belton Texas
unless you crank that spinner up to around 1500 psi you arent gonna see much difference over the bonzer.....

Also when you get that high of water flow you are gonna lose heat out of most HX TM.

i dont think you can clean grout without scrubbing the grout lines.....?????

I have a friend who does a lot of tile and grout...
This is his method:
280 degrees on his kero heater.
uses 3/8" pressure washer hose
2000++ PSI on his separate pressure washer(has a 15-20hp engine)
Uses heavy oxyblast or grout master...

And even then he says he has to scrub most of the time with his cimex......


Well-Known Member
Aug 16, 2006
Belton Texas
probably like carpet...
some light to moderate commercial carpet you may not have to scrub.....

but always better to scrub so you dont have to go back......
just use a crb directly on the grout lines...and stay off the manual grout brush unless you want to wear yourself out in 1-2 hours.....


Active Member
Nov 4, 2020
Real Name
Matthew Olive
glad I got the Titan 575 HP and can go 3000 psi for when I do get into tile/grout.

But for now too busy cleaning carpet and furniture....

this thread did answer one question that I had and that was

why use a spinner vs a hard floor wand when cleaning grout if one were to use a CRB and have a grout brush handy. Seems it would be easier to handle, get under counters better and take up less floor space in the van....
Yes. Is it possible to use a carpet wand to rinse after manually scrubbing?