Our own formula · Made by Think Crucial

Windshield washer fluid concentrate. 16 reservoir refills in 8 oz.

1 tablespoon per quart of water. Made for bugs and road film. Unscented. $1.31 a refill.

4.2from 10 ratings on Amazon(as of Oct 1, 2026)

Think Crucial washer fluid — **Fig. 01**8 oz bottle

Works withCars · trucks · SUVs · RVs

Cars
Trucks
SUVs
RVs
Vans
EVs

Not sure? See how to use it or email support@thinkcrucial.com.

Shipping
Free U.S. shipping on every order
Dispatch
Ships the same business day when ordered by 2pm ET
Promise
Works with the machine we list, or a refund
Returns
30-day returns on unopened bottles

01Spec sheetFrom the listing

What's in the box.

Exactly what ships, and what it works with.

In the box8 oz bottle

1 ×
8 fl oz bottle
concentrate, 16 one-quart refills

Works with: cars, trucks, SUVs, RVs, vans and EVs
Price: 8 oz bottle: $20.99
Subscription: None. Buy when you need it
Made by: Think Crucial, our own formula
Ships: Free, from a U.S. warehouse. Same business day when ordered by 2pm ET; arrives in 2–5 business days

02Before you use itCars · trucks · SUVs · RVs

Check your machine.

Made for the cars, trucks, SUVs, RVs, vans and EVs. If your machine isn't listed, email us before you order.

Cars
Trucks
SUVs
RVs
Vans
EVs

01
Mix
Add 1 tablespoon to 1 quart of water.
02
Fill
Pour the mix into the washer fluid reservoir.
03
Still not sure?
Email your machine's model number to support@thinkcrucial.com and we'll tell you whether it works with it. We reply within one business day.

03QuestionsBefore you order

Before you order.

Straight answers. Anything else, email support@thinkcrucial.com.

Q.01How do I mix it?

1 tablespoon per quart of water. The 8 fl oz bottle holds 16 tablespoons, enough for 16 refills.

Q.02Is it a winter (de-icer) fluid?

No. Our copy doesn't claim freeze protection. It's made for bugs, road grime and sap.

Q.03Does it work in an EV?

Yes. Our copy lists cars, trucks, SUVs, RVs, vans and EVs.

Q.04What if it doesn't work with my machine?

If it doesn't work with the machine we list, email support@thinkcrucial.com and we'll refund it. You don't need to send it back. Unopened bottles can also be returned within 30 days of delivery.

Q.05Is there a subscription?

No. You buy when you need it. Nothing renews and nothing auto-ships.

Q.06When will it arrive?

Free U.S. shipping on every order, from a U.S. warehouse. Ships the same business day when ordered by 2pm ET. Arrives in 2–5 business days.

04Who makes this

We make what we sell.

Think Crucial started in 2007 at a family vacuum repair shop. Today we're a U.S. company in Hollywood, Florida, making descalers and cleaners for the appliances you already own, alongside our aftermarket filters, bags and parts. Each bottle says which machines it's for and how much to use.

Questions before you order? Email support@thinkcrucial.com. We reply within one business day.

Ready to order