Laundry detergent update

So, I've been using the homemade laundry detergent for about a week now. My clothes are nice and clean, I'm pretty happy with it. The only issue is that it seems to re-solidify in the bottle. I have to shake it really hard before I try to pour it out, and then it sill comes out in big lumps. For the next batch, I think I'll try to get my hands on some fels naptha soap and make powdered detergent.