I expect the blooming period for the rhodo is over now. Are there any new buds and leaves starting to grow from where the blooms were yet? The way to deadhead Rhododendrons is to hold the flowerstalk at the base where there are several segments in the stem, and sort of quick bend/snap. The stem should break off just above a segment with three bumps. These three bumps will grow new buds and sets of leaves... And eventually branches.
If the buds are starting to grow already, it's hard not to damage them in the grab-and-snap process, so it's better to use pruners to cut just above the three buds/leaf stalks.
If you need to prune the shrub, this is also the time to cut off or cut shorter any undesirable branches. If you wait another month, it will be too late and you risk cutting off next year's flower buds.
Learning never ends because we can share what we've learned. And in sharing our collective experiences, we gain deeper understanding of what we learned.