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Thanks for that smart answer @Perry

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you are welcome @Amira actually there are a lot of mild no irritating surfactans and here is the list of four groups of mild no irritating surfactants and you can eliminate soduim ones to find your disered surfactants.

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@em88 what are the incompatibilities with HEC ?

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@Amira the disered product should have conditioner “polyquaterniums” , vegeteble oils as ” olive oil , aragan oil” wich help a lot for keeping healthy hair and even protein or keratin to repair the hair. For surfactants it will be better to use mild ones as you said. The ph of shampoo is also important for hair so it should be between 7 and 5 and it will be better to have slightly acid shampoo .
For soduim free it is clear that shampoo must not have soduim whatever even for the surfactants. 

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@Dustin @Perry what is the best level of HEC can be used in shampoo to give  the best viscosity ?

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@KingRoland78 try to reduce the speed of stiring it helps to minimize bubbles.

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@ferrysetiawan perfume must be liposoluble one.

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you are welcome @Ellacho7

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@Ellacho7 about the level of emulsifier it can be from 5% reaching 15% or more generally 10% is able to give stable emulsion .

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@Das actully the study gives details it is just a curve from the study what i shared about surfactants it is just a blend of only SLES et CAPB.

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Thanks @ngarayeva001 always giving help @Chemist77 @Perry @DAS have you an idea about that ?

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@Gunther  I made the same constatation , but even it seems strange that what experiences gave and the stranger That this study used just SLES as other surfactant with CAPB. So as first impression SLES supposed can not reduce the irritant effect of CAPB However the experiences proved the opposit.

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@nara i guess sucragel can make cold emulsion .

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@deeps88 gives the Lol to  have better help.

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you are welcome @shaujaat

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@shaujaat for sure you just need low level of perfume to have acceptable odor using ethanol or IPA.

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@shaujaat for cost you can decrease the level of IPA or even to replace it with ethanol and about effecacity i already made glass cleaner without vinegar and it works good so you just need to find the adequat levels of each ingredients.

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As @Perry said presevative are not adequat for skin antibacterial effect cause almost are toxic so even in cosmetic formulation must used at the adequat level.

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@shaujaat you don’t need to make vinegar to make glass cleaner you can just use water, isopropanol , preservative , perfume and colorant if you want.

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@nara you should make research for water in oil emulsifier .

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hi @shireen make your Lol in percentage to have more suggestions and for stearic acid i see it used not at high level so check ph of your product if it is good then no need to neutralisation unless you can use NaOh to do it.

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@erickafalves actually my interpretarion matching the decreasing of ph and changing fragrance note that your perfumes in product are not stable enough so as probable solution i suggest to add more preservative or change it  that’s may solve your problem.

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@UsmanAli actually ph between 10 and 11 is real problem for skin and it is normal to cause irritation ph should be generally in cosmetic below 8.

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thanks @Chemist77 yes for sure i already use pvp in my product .

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Update : i make hair creme-gel based on olive oil and carbomer so it gives   medium holding and smoothing effect  without flaking ☺.