
The plastic is very thin. It stains if the contents are anything but plain water. Soaking in warm/hot water will remove most or all of the stain - but it will stain again.These bottles are exactly what I wanted as far as size, price and "squeezability." But be aware of what you're getting (cheap, cheap, cheap).

4 Oz. Amber Boston Round Glass Bottles With Black Dropper - Pack Of 24
11 Review

Get Your All-Purpose Cleaning Solution With Bealee'S 24 Oz Plastic Spray Bottles - 2 Pack
16 Review

Graduated Erlenmeyer Glass Flask Set With Narrow Mouth - 500Ml Capacity
15 Review

2-Pack 32Oz All-Purpose Heavy Duty Plastic Spray Bottles - Leak Proof, Adjustable Nozzle For Cleaning, Planting & Pet Care - Green
22 Review

Premium Grade DMSO Roll-On - Non-Diluted 99.995% Low Odor - 3 Oz. Bottle - BPA-Free Container
10 Review

Enhancing Soil Quality with Calcium Sulfate Dihydrate Gypsum: CaSO42H2O
3 Review

California Gold Nutrition CollagenUP por., 464 g
23 Review

Semi-synthetic engine oil IDEMITSU Zepro Euro Spec 5W-40, 4 l, 3.84 kg, 1 pc.
26 Review