How to Clean Acrylic Aquarium | Without Scratching It

Clean an acrylic aquarium with a soft microfiber cloth and an acrylic-safe cleaner or polish, avoiding ammonia, alcohol, and abrasives that cause permanent haze.

For the full breakdown, see our best Acrylic Aquarium guide.

Acrylic aquariums scratch far more easily than glass, so the cleaning routine that works on a standard tank can ruin an acrylic one. The difference comes down to one rule: keep anything abrasive away from the panels. Sand, gravel, rough pads, and even some glass cleaners can leave permanent scratches. Here is how to clean your acrylic fish tank safely, inside and out, so it stays crystal clear for years.

What Not To Use On Acrylic Tanks

The quickest way to ruin an acrylic aquarium is reaching for the wrong cleaner. Get Tanked, an acrylic tank builder, warns against products containing ammonia, alcohol, or abrasives such as Windex, Comet, or Ajax, because they can permanently reduce clarity. Those ingredients attack the acrylic surface and leave a cloudy film that polishing cannot fully reverse.

Keep these away from acrylic panels:

• Glass cleaners with ammonia or alcohol
• Abrasive powders like Comet or Ajax
• Steel wool, scouring pads, or coarse sponges
• Metal scrapers or blades
• Any cloth that has picked up sand or floor grit

Get Tanked also notes that acrylic tanks should never be exposed to paints, varnishes, turpentine, or their fumes, which can damage the material. Regular maintenance cleaners should be designed specifically for acrylic — Tenecor guidance names Novus and Plexus as suitable options. A soft cloth with plain water works for light dust and smudges.

How To Clean The Inside Of An Acrylic Aquarium

Before touching the interior panels, move sand and debris away from the front and sides of the tank. If grit gets trapped between your cleaning tool and the acrylic, it will scratch the surface — one aquarium-care guide warns that cleaning while sand is present can more than likely scratch the tank.

Once the sand is pushed aside, let suspended particles settle for about 30 minutes before scraping or wiping. Then follow this order:

1. Scrape algae and hard growths with a plastic scraper or card designed for acrylic. Keep the tool flush against the panel and use gentle pressure — angled scraping digs in.
2. Wipe the panels with a soft microfiber or cotton cloth. For stubborn spots, use an acrylic-safe pad, never a coarse sponge.
3. Spot-treat mineral deposits if needed with a diluted vinegar solution on a cloth, then rinse the area with clean water. This trick appears in general aquarium guides rather than manufacturer documentation, so test it on a small area first.
4. Rinse decorations and rocks in old tank water rather than tap water when you remove them for cleaning.

If you need to remove decorations for cleaning, use a bucket of aquarium water you just siphoned out — it preserves the bacteria colonies your filter depends on.

How To Clean The Outside Of An Acrylic Aquarium

Exterior cleaning is simpler but has its own rules. Spray the cleaner onto the cloth, never directly onto the tank — liquid running down the panel can seep into seams or drip into the water. Then wipe in gentle, consistent strokes and dry with a clean microfiber cloth. This spray-the-cloth routine is repeated across multiple aquarium-care guides because it prevents streaks and keeps cleaner out of the tank.

For everyday smudges and fingerprints, a dry microfiber cloth usually does the job. For dried residue or water spots, dampen the cloth with water or a small amount of acrylic polish, then buff dry.

Keeping Acrylic Clear With The Right Routine

A little prevention beats heavy cleaning every time. Rinse your cloth before each use and check that no grit has collected on it. If you use a plastic blade or scraper, keep it at a shallow angle with light pressure — the goal is lifting algae, not carving into the panel. Several guides recommend cleaning on a schedule, with one video transcript suggesting weekly maintenance and another guide recommending every two weeks.

A consistent, gentle routine keeps haze and buildup from ever taking hold, which means less scraping and fewer chances for scratches. If you are shopping for a new tank or looking for acrylic-safe cleaning supplies, our tested roundup of the best acrylic aquariums covers models that suit different budgets and setups.