We may not think of the ease of cleaning to be the key aspect of a digital scale. After all there are some critical components in a digital scale that one needs to check out first. Such as the load cell or the material of which the platform is made or the display. But the fact is that with time you can be pretty sure you are going to get great quality as far as these components are concerned so long as you buy a scale from a reputed manufacturer.
The ease to clean is what will be of more day to day concern for you than most of the high tech components that go into the making of a digital scale. And if the level of cleanliness you require is very high then while cleaning it you would not like to be hindered by being careful about where you target your water jet. And if that is what you require then a washdown floor scale is the best option for you.
When you have to clean a digital scale thoroughly you will very much like to be able to focus just on the cleaning and not on protecting the sensitive components of the scale. For you to be able to do that the scale needs to be designed in such a way that even if the scale is exposed to copious amounts of water, its sensitive components remain well protected and do not get damaged. And those parts of the scale that do get exposed to the water and able to handle the repeated exposure to water easily without rusting or getting damaged in some way.
Remember that water may seem harmless to us but regular exposure to it can easily lead to damage and even highly engineered products can become the victim of rusting. If adhesives have been used in the manufacture of the product they too may lose their adhesive properties on routine exposure to water.
The high quality manufacturers though do a great job of waterproofing their product and you can clean your scale easily and without worries.