White vinegar might be the best replacement for fabric softener
Why White Vinegar Should Be in Your Laundry Room
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Can You Use Vinegar Instead of Fabric Softener?
Healthy Home Swaps : Fabric Softener - Clean Mama
What are the benefits of adding vinegar to laundry soap and/or fabric softener? How does it compare in effectiveness to using them without vinegar? - Quora
How to Use Vinegar in Laundry (and When It's Best to Avoid It)
This Easy Homemade Fabric Softener Cleans As It Softens
DIY Vinegar Fabric Softener - The Creek Line House