Grandma's Secret · Fabric Protection Treatment Sprays
Grandma's Rub-On Laundry Stain Stick
Lower concern; soap-based products rarely contain PFAS historically.
Grandma's Secret is a soap-based stain removal stick with no known PFAS-related ingredients or treatments. Brand makes no PFAS claims; no independent testing available to confirm.
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Material
Soap-based laundry stain stick, solid bar
Brand disclosure
Brand is silent on PFAS
Lab data
No public lab test
Why this grade
Stain-resistant finish
Stain-resistant finishes are a common PFAS use.
Category baseline
furniture is a category where PFAS exposure is more common.
No PFAS disclosure
No public statement about PFAS in this product.
The full breakdown
What it's made of and why it matters
Grandma's Secret Rub-On Laundry Stain Stick is formulated as a concentrated soap bar designed to be rubbed directly onto fabric stains before washing. Soap-based products rely on surfactants (typically derived from animal or plant oils) to break down oily and protein-based stains without relying on harsh synthetic solvents. The solid bar format means minimal water content and no need for preservatives like 1,4-dioxane or formaldehyde releasers that are common in liquid detergent concentrates.
The brand's record and disclosure
Grandma's Secret is a small, family-owned brand with limited public safety documentation or third-party certifications on file. The company does not appear to have issued detailed ingredient disclosures, allergen warnings, or sustainability claims in widely accessible format. No significant safety recalls or legal actions related to this product have been documented in public records.
How it compares in its category
As a solid soap stick, this product sits at the lower-complexity end of laundry stain treatments. Compared to spray-on or liquid pre-treaters (which may contain solvents, optical brighteners, or antimicrobial agents), the bar format is chemically simpler and typically has fewer additive layers. This simplicity generally translates to lower chemical exposure during use, though the product lacks third-party testing or eco-certification that some competitors offer.
If you buy it
Apply the stick to dry or slightly damp fabric, rub gently in circular motions, and wash within a few minutes to an hour for best results. Store in a dry location away from direct heat or sunlight to prevent the bar from softening or deteriorating. Do not use on delicate fabrics (silk, wool) without pre-testing on an inconspicuous area, as the friction of rubbing can damage fibers. Discontinue use if skin irritation occurs; rinse thoroughly with water if contact with eyes or mucous membranes happens.
Beyond PFAS: other things we checked
Established hazard classes for this product type, assessed from public information. These never change the PFAS grade; a Likely flag caps the Verdict at “Buy with care.”
Surfactant-derived skin irritation
Soap-based stain sticks can cause localized skin irritation or allergic contact dermatitis in sensitive individuals if the bar is rubbed directly on skin or if residue remains on fabric after incomplete rinsing. No specific incidents reported for this brand.
Fragrance allergens
If the product contains added fragrance compounds (common in consumer laundry bars), undisclosed allergens like limonene or linalool may trigger reactions in sensitive users. Grandma's Secret does not publicly list fragrance components.
Heavy metals in colorants (if dyed bar)
If the bar contains added dyes for appearance, synthetic colorants could theoretically carry trace heavy metals; however, no test results or complaints are on public record for this product.
Degradation and residue buildup on fabric
Repeated rubbing of concentrated soap bar on the same fabric area may leave a waxy or soap residue if not thoroughly rinsed, potentially stiffening fibers or attracting dirt over time with laundering.
Contamination from hand transfer during use
Because the product is rubbed directly by hand, it may pick up bacteria, dirt, or other contaminants from skin and nails if the bar is not kept clean and dry between uses.
What we don’t know
This grade is a model-based estimate from public materials, coatings, and brand disclosure at 72% confidence. It is not a lab result.
No independent PFAS lab test is on record for this exact product. A lab test could move the score in either direction.
The brand has not made a specific, verifiable PFAS-free statement, so part of this score reflects that missing disclosure rather than a confirmed material.
Formulations and coatings change between production runs. Always check the current label before buying.
Safer alternatives in Fabric Protection Treatment Sprays
Fels-Naptha
Fels Naptha Laundry Bar Soap
Soap base (tallow, coconut oil, other saponified fats), hexachlorophene preservative (historical)
Lower PFAS concern for traditional bar soap product.
⚠Risky category by default
Fels-Naptha
Fels Naptha Laundry Bar
soap bar, vegetable and tallow oil base
Lower concern, traditional soap bar with no PFAS triggers.
⚠Risky category by default
Fels-Naptha
Fels Naptha Laundry Soap & Stain Remover Bar
soap bar, vegetable and animal oils
Lower PFAS concern. Traditional soap bar without known treatment risks.
⚠Risky category by default
More fabric protection treatment sprays grades
How we score: every product runs through the same public 0–100 rubric based on materials, coatings, brand disclosure, lab findings, and recalls. See the full methodology → Spotted a mistake? Report an error.