When it comes to cleaning supplies, it’s worth going through your collection to see which items can continue being used and which ones need a replacement since they’re worn down.

We spoke with two professional cleaning experts who weigh in on these items and more. Below, they speak to best practices that will ensure your home stays as fresh and hygienic as possible.

Sponges

How long have you been making use of your go-to sponge? In case you weren’t aware, sponges are not meant to be used for weeks on end.

“Sponges are one of the biggest bacteria collectors in the kitchen,” Lexy Ford, the founder of Passion Organizing, says. “Because they are constantly exposed to moisture and food particles, they quickly become breeding grounds for harmful germs.”

As such, Ford advises making a point to throw away your sponge and replace it with a new one every two weeks. Of course, she adds, if your sponge is starting to smell or break apart, be sure to replace it even sooner.

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Toilet Brushes

Many people move into a new space with a brand new toilet brush and don’t think to replace it again until years down the line. However, this practice is definitely not advised.

“Your toilet brush might be spreading more germs than it’s cleaning,” Ford says. “Since it regularly comes in contact with bacteria, it can easily become contaminated, especially if it doesn’t dry properly between uses.”

For the most hygienic approach, be sure to replace your toilet brush once every six months, Ford suggests.

Liquid Cleaning Products

If you feel as though you have been holding onto the same cleaning products for quite some time, the below insights are for you.

“Many people assume that cleaning products last forever, but the truth is that their effectiveness diminishes over time,” Ford says. “Disinfectants, glass cleaners, and multi-purpose sprays can lose their potency as their active ingredients break down.”

The next time you buy a new bottle of liquid cleaner, Ford recommends using a permanent marker to write down the purchase date. Be sure to then use the product within six to 12 months after that for the best results.

Mops

When it comes to your mop, Robin Murphy, the owner of Maid Brigade, explains the importance of washing and disinfecting it after each use. Only putting it away after using it is not good hygiene, Murphy says.

Even so, a given mop isn’t going to last forever. Murphy explains that microfiber mops, which she says are more hygienic than string or sponge mops, can last you about six to nine months. Otherwise, though, she encourages people to replace their sponge mops after two months and string mops after three to six months.

Brooms

The concept of replacing a broom may seem foreign to some.

“Nobody replaces brooms, but the bristles wear down and they become less effective,” Murphy says.

She encourages people to keep an eye out for frayed and bent bristles, which suggest your broom is on its last leg. Generally, Murphy says, a broom will last you one to two years depending on use.

Dish Towels

Think about how often you reach for your dish towel during the day. Murphy will use hers not only to dry her hands but also to wipe down the sink area, for example.

While you do not need to replace dish towels until they’re becoming unraveled, you do need to be mindful about washing them, likely far more often than you might think—Murphy recommends doing so every couple of days.

Vacuum Filters

The right vacuum will last you years on end, but it’s essential to keep an eye on the filter. Murphy suggests washing the filter or replacing it every so often because they trap dust and pet dander. She will replace her own every three to six months, noting that when it comes to washable filters, she will wash these once per month.