Quick Overview

Purex Fels-Naptha (also sold as ZOUT Fels-Naptha in some listings) is a 5 oz laundry bar formulated to remove greasy and oily stains, perspiration marks, and the notorious ring-around-the-collar. It’s a manual, easy-to-use stain treatment for both handwashing and machine washing. The bar is designed for everyday household use and is made in the United States.

Product Specifications

Why It Works

Fels-Naptha is a concentrated laundry bar with cleaning agents designed to break down oily and protein-based soils on fabrics. When applied to a damp stain, the bar helps lift and emulsify the stain so standard washing removes it more effectively. Its long history — over 100 years in laundry care — reflects a reliable formula that home users trust for spot treatment.

How to Use — Step-by-Step

1. Wet the stained area with warm water (if fabric care label allows).
2. Rub the wet bar directly onto the stain, applying gentle pressure to work the soap into the fibers.
3. Let it sit for a few minutes — this gives the bar time to penetrate and lift the stain.
4. Wash the garment as you normally would (follow the care label).
5. Check the stain before drying. Repeat treatment if necessary — do not machine-dry until stain is gone, as heat can set stains.

Extra Cleaning Power (Tip)

For a wash-load boost: finely grate about half the bar (use less for smaller loads) into the washer. Start the washer with water and agitate a few minutes to dissolve the shavings, then add clothing. This creates an in-wash stain booster for heavily soiled loads. Note: Fels-Naptha is non-HE formulated — use sparingly in high-efficiency machines and consult your washer manual.

Key Benefits

• Targets greasy, oily stains and protein soils like sweat and collar rings.
• Compact 5 oz bar — great for travel, laundry rooms, and emergency spot treatment.
• Suitable for hand treatment and for adding to wash cycles (as a booster).
• Longstanding, trusted formula with decades of household use.

Safety & Fabric Care Notes

Always test on an inconspicuous area for colorfastness before treating a visible stain, especially on delicate or dark fabrics. Avoid using on fabrics labeled “Dry Clean Only.” Follow garment care labels and machine manufacturer recommendations for non-HE vs. HE use.

Frequently Asked Questions

Is Fels-Naptha safe for all fabrics?

It’s safe for many washable fabrics, but delicate fabrics (silk, wool, acetate) and items labeled “Dry Clean Only” may be harmed. Always patch-test first.

Can I use this in a HE (high-efficiency) washing machine?

The bar is described as non-HE formulated. When using any concentrated product in HE machines, use sparingly and follow your washer’s guidelines.

Will the bar remove set-in stains?

Fresh stains respond best. Set-in stains may require repeat treatments or professional cleaning; heat from drying can permanently set some stains.

How long should I let the product sit on a stain?

Usually a few minutes is sufficient. For stubborn stains, you can let it sit longer but avoid letting soap dry completely on the fabric before laundering.

Bottom Line

Purex Fels-Naptha (ZOUT) 5 oz laundry bar is an affordable, compact and time-tested stain fighter for grease, oil, sweat and collar stains. It’s a handy addition to any laundry kit — especially for spot treatment and for boosting heavily soiled loads when used carefully.