What is the quickest way to replace whole WORD with spaces?

Hi,

Sample data:
aaa bbb:123:ccc ddd

Desired result:
aaa ddd

What is the quickest way to replace second WORD with spaces?

Now I use several keystrokes:
fb - find letter b
vaW - visual also WORD
r<Space> - replace with space

I know I can set a mapping like pressing minus key and do the task:
noremap - vaWr<Space>

but I am doing a lot of SSH, so don't want to mess with mappings on each of server.

What is the quickest way to replace WORD with spaces in vanilla Vim settings?

Thanks

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