Source: https://pxhere.com/th/photo/1175890
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Hello @steemcleaners. This image has a CC0 license - which is clearly mentioned. And I certainly don't have to tell you that in this case it is not necessary to name the source and use it as well in commercial sense. That's what the CC0 license is made for.
"Images and Videos ... are released under Creative Commons CC0. To the extent possible under law, uploaders ... have waived their copyright and related or neighboring rights to these Images and Videos. You are free to adapt and use them for commercial purposes without attributing the original author or source."
In case you have any more questions concerning licenses don't hesitate to ask me.