<HTML>Brian,
It really depends on several things.
One being the quality of the components
Two being the components, some of the less expensive degreasers (surfactant cleaners) use some pretty inexpensive components, like metaslica, TSP, and a lot of butyl cellosolves.
Three being the type of emulsifier the manufacturer used to make the solution.
These often, don't like to go back together once frozen, breaks the emulsion/emulsifier.
If it has a fragance in the product, that may well affect how it may go back.
All you can do is get it thawed out, and without shaking first, stick a probe down into the bottom and see if the actives are on the bottom, "broke out of emulsion", if there is a thick substance on the bottom, hard to get all the active back in solution.
Now you can shake the hell out of it, and let it set for an hour or so, recheck with the stick to see if the active components are staying in suspension, if they are, you should be ok.
If not, you will have to be sure and shake it well everytime you go to use it, and even then, it will probably not work like it would have before frozen, as a rule.
Good luck, just don't let products freeze, even quality products, with high grade components will only take on average, two freeze/thaw cycles before quality is comprised.
Ketch</HTML>
Do it right or don't do it all!