Prevent Your Muslin Cotton From Getting Rough Over Time

If your cotton item feels rougher than it did when you first bought it, you're not imagining it. It's not that the fabric has turned against you.

Natural cotton is, by design, supposed to get softer with use and age, not coarser or rougher. When the opposite happens, something in the wash routine is working against the fabric.

The Most Common Causes

1. Detergent Buildup

When detergent isn't fully rinsed out, it leaves a residue in the fibers. Over time, this residue accumulates and creates a stiff, rough texture.

This is especially common when too much detergent is used per wash, or when the rinse cycle isn't thorough enough.

Fix: Use the correct amount of detergent (less than you think), run an extra rinse cycle occasionally, and switch to a formula that rinses cleanly.

2. Enzyme-Based Detergents

Many mainstream detergents contain enzymes designed to break down organic material. Cotton is a natural, cellulose-based fiber—which means those enzymes can gradually affect the fiber structure itself.

The result isn't always visible breakdown. Sometimes it shows up as a change in texture: fibers that once felt smooth begin to feel coarse or uneven.

Fix: Switch to an enzyme-free detergent formulated for natural fabrics, like Bio Brite.

3. Hard Water Mineral Deposits

If your home has hard water, minerals like calcium and magnesium can deposit into fabric fibers during washing. These deposits create a stiff, scratchy feel that worsens over time.

Fix: Add a small amount of white vinegar to the rinse cycle to help dissolve mineral buildup. A water softener is a longer-term solution.

4. High Heat Drying

Excessive dryer heat causes cotton fibers to contract and harden. Over repeated cycles, this contributes to a rougher texture and accelerates overall fiber wear.

Fix: Dry on low heat or line dry when possible. Remove sheets promptly when the cycle ends to prevent heat from continuing to affect the fabric.

5. Fabric Softeners (Counterintuitively)

Fabric softeners feel like the obvious solution to rough sheets—but they often make the problem worse over time. They coat fibers with a waxy layer that initially feels soft but builds up with each wash, eventually reducing breathability and creating a dull, heavy texture.

Fix: Stop using fabric softener entirely. With the right detergent and proper care, cotton softens naturally without additives.

Why Cotton Might Get Rougher, Not Softer

Pure high-quality natural cotton has a break-in period. In the first several washes, the fibers continue to relax and the fabric becomes progressively softer and more comfortable. 

This is one of the defining characteristics of pure natural cotton—it improves with use when cared for correctly.

When cotton get rougher -not softer, it's a signal that something' s wrong in the washing process. The routine is working against the natural fabric, rather than with it.

Restore The Softness

If your muslin cotton is already rough, here's our reset protocol:

• Wash with hot water and a cup of white vinegar (no detergent) to strip buildup
• Follow with a normal wash using Bio Brite
• Dry on medium or high (All Muslin Comfort products are preshrunk.)
• Repeat the vinegar wash monthly if you have hard water

Most items will recover meaningful softness within a few wash cycles once the buildup is cleared and the right detergent is in use.

The Bottom Line

Rough cotton items are almost always a care problem, not a fabric quality problem.

Identify which factor is at play—detergent residue, enzymes, hard water, heat, or softener buildup—and address it directly. Natural cotton is resilient when treated correctly.

Shop Bio Brite — formulated for natural cotton, tested for nearly a decade.