Where does “mydlinka” come from?

mydlinka (Slovak) comes from Slovak mydlina, from Slovak mydlo, from Proto-Slavic mydlo, from Proto-Slavic -dlo, from Proto-Indo-European -dʰlom — Alternative form of *-trom; instrumental suffix;...

Ancestry of “mydlinka”, step by step

Step	Language	Word	Meaning
1	Slovak	mydlina	soapy water
2	Slovak	mydlo	soap
3	Proto-Slavic	mydlo	soap
4	Proto-Slavic	-dlo	Forms nouns denoting a tool or instrument
5	Proto-Indo-European	-dʰlom	Alternative form of *-trom; instrumental suffix;...

Every word from Proto-Indo-European -dʰlom →Every word from Proto-Slavic -dlo →Every word from Proto-Slavic mydlo →