Check your Ibotta app for a $5 rebate on Arm & Hammer laundry detergent at Walmart.
You'll need to clip the offer before checking out, then purchase a 150-ounce container for $15.98 and upload an image of the receipt to the app for a $5 cash back, bringing the total to just $10.98. That's only $0.11 per load.
If you were already planning an online order, link your accounts to use Ibotta with Walmart pickup. I've also done this with Ibotta deals when doing Walmart grocery delivery or shipping.
When you follow KCL on Telegram, you'll see the newest savings on essentials.