Grandma's Secret · Fabric Stain Guard Sprays
Grandma's Rub-On Laundry Stain Stick
Lower concern; soap-based products rarely contain PFAS historically.
Grandma's Secret is soap-based stain removal stick without known PFAS-related ingredients or treatments. Brand makes no PFAS claims and no independent testing exists.
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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
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What Grandma's Rub-On Laundry Stain Stick is made of, ingredients and materials
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.
What’s concerning
No PFAS disclosure
No public statement from the brand about PFAS in this product.
Category baseline
The starting point for this type of product, before anything specific to this product is counted.
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.
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’s reassuring
Base material not linked to PFAS
The main material recorded for this product is not one associated with PFAS.
Heavy metals
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.
Source, FDA ↗The full breakdown
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.
What we don’t know
- Basis
- Model estimate, 72% confidence, not a lab result
- Lab test
- None on record for this exact product
- Brand statement
- Grandma's Secret has made none
Formulations change between production runs, so check the current label. How we grade.
More fabric stain guard 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.