It might be the quality of your fabric. I have been using a lot of RK fabrics. I spray starch some of the wrinkles and that always seems to work. I have never had "ripples" in my fabric.

I don't prewash either. I always iron with a dry iron and Best Press before cutting. I just spray, give it a couple of seconds and iron. Sometimes the surface you're ironing on can have an effect. My guild has a big board with one of those stick on covers and the fabric can look a little wavy after ironing on that.

One tablespoon of vinegar to a cup of water in a spray bottle. It's wonderful!!

I'm concerned with the term "ripples". Are you speaking about ripples when you fold the fabric and match the selvages there are ripples on the fold? If so, it's because you fabric is not straight. That problem can not be fixed with ironing, you need to straighten. As far as getting wrinkles out I use steam and I always starch my fabric before cutting to give it stability. That works for me. I never prewash, just use color catchers and haven't had any problem.

Thank you all. What I meant by ripples, was the edges of the fabric sometimes come out wavy. I'm going to give the vinegar and water a try. Thanks again for your help.

....oh, that bag of sprinkled things in fridge....memories......I still will sprinkle and bag large pieces and let sit overnight when ready for use, if they need it...usually just a spritz or two while ironing is all that is needed though. ....and no, I do not put in fridge anymore.....and no starch either....

I steam iron mine, sometimes I have to use a damp pressing cloth.

I would just wash and dry it. I always pre wash all my fabrics as soon as I get them home.

I use Terial Magic. Alittle goes a long way.

I'm with the pre-washers...if you have that much trouble with ironing the fabric smooth, it seems to me it would just be quicker to throw it all in the washer, get the sizing, etc. out of the fabric, throw in the dryer so any shrinking that's going to be done is over with. After drying, or even before it is quite dry, remove and press. Of course you can't do this with tiny precuts, but I even wash fat quarters. I use my quilts, so they will eventually get thrown into the dryer. I want any shrinkage to occur before I cut the fabric, not after it is in the finished quilt.