Spin chirality of polycrystalline MnSi, or, difficult way from rumours to the solid ground

► Six different polycrystalline samples of MnSi were produced as a rapidly frozen melt. ► The magnetic spin chirality is shown to be scanned along the sample length. ► The chirality oscillates strongly on a scale of 2-3 mm. ► It reveals the volumes of the samples with high degree of an enantiomeric excess. ► The average chirality of the samples deviates from zero value.