2 capfulls in the washer tank. Works a treat and lasts for ages.
1 - 2 capfulls in the washer tank is all you need. Dont flip the cap and squirt it in, you'll just waste it. I've been using this product (although labelled as Holden not AC Delco) for around 20 years. The bottles of concentrate just last and last. Really good at degreasing the glass and doesnt leave marks on paint etc. Tried several other generic brands but this genuine product is worth buying over every non OE brand.
I have used this product for more than 5 years now and have not had any issues what so ever. It does what is advertised on the bottle. Also if used as directed it will last a long time. Great product.