If I have a cleaning recipe that calls for castille soap

[bstandlee]

...and I use Dr. Bronners, how much do I dilute?

For example, I have a recipe for a antiseptic spray that calls for 3 Tablespoons Dr Bronners along with tea tree oil and water. I found out the hard way that 3 T Dr B's is WAAAAY too much! But, I still want it to be antiseptic so I don't want to cut it back too much.

Ok, maybe I'm being anal! But does anyone have a recommendation for how much to dilute the Dr B's and still keep the antiseptic power (even though the tto has power too, I know)?

Thanks!