Cleaning Calcium Buildup from Your Greenhouse Glass with CLR

Calcium deposits from hard water can cloud up greenhouse glass, cutting down light for your plants. CLR (Calcium, Lime, and Rust Remover) cuts through this buildup without much effort. This guide shows how to use it to get your glass clear again.

Why Calcium Builds Up and Why Use CLR

Hard water leaves minerals that stick to glass, especially in greenhouses with constant exposure. This haze blocks up to 30% of light, hurting plant growth. Regular cleaners don't touch it.

CLR uses mild acids to dissolve calcium without harming glass. It's safe for greenhouse panels and works fast on exterior surfaces.

Supplies You'll Need

- CLR cleaner

- Spray bottle

- Soft sponges, rags or non-scratch brushes

- Squeegee

- Hose with low-pressure nozzle

- Gloves, eye protection

- Bucket of water

Test CLR on a small spot first.

How to Clean Step by Step

Do this on a cloudy day to keep the solution from drying too fast. Work in sections for big greenhouses.

1. Prep: Move plants and tools out of the way. Hose off loose dirt from inside and out.

2. Apply CLR: Mix 50/50 with water in the spray bottle. Spray on affected areas. For tough spots, use full strength. Let sit 2-5 minutes until it fizzes.

3. Scrub: Use a soft sponge in circles to lift the deposits. Start at the top on vertical panels.

4. Rinse: Hose off with low pressure or wipe with a damp cloth. Use the squeegee to avoid streaks. Rinse again with plain water.

5. Dry: Wipe with soft cloths or rags.

Takes 1-2 hours for an 8x8ft greenhouse.

Wrap-Up

CLR makes quick work of calcium on greenhouse glass, letting more light in for better plants. Try it next time you notice the haze.