How do I get my brushes clean after using sugar glaze on my flowers? Thanks.

You mean confectioner's glaze? That one needs ethanol. It is like the rejuvenator spirit but it is not pure so it is used only as brush cleaner. Fill a shot glass with it, dip brush/es, move them around, have kitchen paper on hand, wipe brush, repeat till it feels clean then clean with warm soapy water, rinse well, reform bristles and air dry.

Be careful you don't mix brush cleaner with rejuvenator spirit! Brush cleaner can be lethal. 

CK Products has a confectioners glaze and a confectioners glaze thinner (to clean). I use the and my brushes bounce back every time.