We vacuum every day and have them steam cleaned once a week. Thankfully we’re in the process of removing the carpet and replacing with LVP. So much easier to walk around with a steam mop to keep the hallways sparkling clean

We have a couple Hyla vacuums they are professional grade and have water filters so nothing escapes. You can see all of the sand, dirt, and hair in the water when you empty it. There are 8 floors and we all take turns. Takes about an hour. And yes the steam cleaning is contracted out to a local company (Chem-Dry) that actually uses a dry cleaning method so it’s better than traditional steam cleaning. We do have a cleaning crew that comes in to clean the lobby and fitness rooms daily but they wanted way too much to do the vacuuming for us. I honestly don’t mind. It gets me away from my desk and walking around the building

In house carpet cleaning machine and the darker the better. About to replace 4 year old carpet that needed it 2 years ago. Pain in the booty

Number one thing is to NEVER use any kind of shampoo/detergent/cleanser on carpet. You can never get it all out & the residue attracts more dirt like a magnet. Use a service like zerorez.com
or an enzymatic cleaner. Even just using straight vinegar in place of shampoo will remove residue from previous shampooings & sanitize at the same time. (Vinegar also works great in the rinse cycle of your washing machine instead of fabric softener. That's all a fabric softener does - remove soap residue.)

Cleaners vacuum and spot clean daily as needed; full cleaning of the elevator and hallway carpeting when needed?

The key is to have dark hallways; then no one can see the flooring.

Go to Walmart and find a product in the automotive section called Super Clean. It cleans spots and dirt from carpet. I used it in a high rise in Dallas that had plum colored carpets in the hallways. It also cleans walls, ovens, and bathtubs too. Amazing stuff. I

We have carpet tiles that we replace when needed. But we also have the carpets cleaned on a monthly basis on every level by our carpet cleaning company. It definitely helps and they use a pet deterrent on the carpet each time they clean it.